scholarly journals Dissecting the role of initial collision geometry for jet quenching observables in relativistic heavy ion collisions

2010 ◽  
Vol 82 (2) ◽  
Author(s):  
Jiangyong Jia ◽  
Rui Wei
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Jet Quenching ◽  
Relativistic Heavy Ion Collisions ◽  
Ion Collisions

scholarly journals The global geometrical property of jet events in high-energy nuclear collisions

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Shi-Yong Chen ◽  
Wei Dai ◽  
Shan-Liang Zhang ◽  
Qing Zhang ◽  
Ben-Wei Zhang
Keyword(s):  
Energy Loss ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Energy ◽  
Jet Quenching ◽  
Relativistic Heavy Ion Collisions ◽  
Parton Energy Loss ◽  
Boltzmann Transport ◽  
Ion Collisions ◽  
Medium Modifications

AbstractWe present the first theoretical study of medium modifications of the global geometrical pattern, i.e., transverse sphericity ($$S_{\perp }$$ S ⊥ ) distribution of jet events with parton energy loss in relativistic heavy-ion collisions. In our investigation, POWHEG + PYTHIA is employed to make an accurate description of transverse sphericity in the p + p baseline, which combines the next-to-leading order (NLO) pQCD calculations with the matched parton shower (PS). The Linear Boltzmann Transport (LBT) model of the parton energy loss is implemented to simulate the in-medium evolution of jets. We calculate the event normalized transverse sphericity distribution in central Pb + Pb collisions at the LHC, and give its medium modifications. An enhancement of transverse sphericity distribution at small $$S_{\perp }$$ S ⊥ region but a suppression at large $$S_{\perp }$$ S ⊥ region are observed in A + A collisions as compared to their p + p references, which indicates that in overall the geometry of jet events in Pb + Pb becomes more pencil-like. We demonstrate that for events with 2 jets in the final-state of heavy-ion collisions, the jet quenching makes the geometry more sphere-like with medium-induced gluon radiation. However, for events with $$\ge 3$$ ≥ 3 jets, parton energy loss in the QCD medium leads to the events more pencil-like due to jet number reduction, where less energetic jets may lose their energies and then fall off the jet selection kinematic cut. These two effects offset each other and in the end result in more jetty events in heavy-ion collisions relative to that in p + p.

scholarly journals Flavor hierarchy of jet quenching in relativistic heavy-ion collisions

2020 ◽  
Vol 805 ◽  
pp. 135424 ◽  
Author(s):  
Wen-Jing Xing ◽  
Shanshan Cao ◽  
Guang-You Qin ◽  
Hongxi Xing
Keyword(s):  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Jet Quenching ◽  
Relativistic Heavy Ion Collisions ◽  
Ion Collisions

scholarly journals Jet structure in heavy ion collisions

2015 ◽  
Vol 24 (11) ◽  
pp. 1530012 ◽  
Author(s):  
J.-P. Blaizot ◽  
Y. Mehtar-Tani
Keyword(s):  
Heavy Ion Collisions ◽  
Turbulent Transport ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Jet Quenching ◽  
Relativistic Heavy Ion Collisions ◽  
Ion Collisions ◽  
Parton Cascade ◽  
Probabilistic Nature ◽  
Jet Structure

We review recent theoretical developments in the study of the structure of jets that are produced in ultra relativistic heavy ion collisions. The core of the review focusses on the dynamics of the parton cascade that is induced by the interactions of a fast parton crossing a quark–gluon plasma. We recall the basic mechanisms responsible for medium induced radiation, underline the rapid disappearance of coherence effects, and the ensuing probabilistic nature of the medium induced cascade. We discuss how large radiative corrections modify the classical picture of the gluon cascade, and how these can be absorbed in a renormalization of the jet quenching parameter [Formula: see text]. Then, we analyze the (wave)-turbulent transport of energy along the medium induced cascade, and point out the main characteristics of the angular structure of such a cascade. Finally, color decoherence of the in-cone jet structure is discussed. Modest contact with phenomenology is presented towards the end of the review.

scholarly journals Influence of Spatial and Dynamical Anisotropies on Flow and Femtoscopy Radii in Relativistic Heavy-Ion Collisions at LHC Energies

Proceedings ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 3
Author(s):  
E. Zabrodin ◽  
L. Bravina ◽  
I. Lokhtin ◽  
L. Malinina ◽  
S. Petrushanko ◽  
...  
Keyword(s):  
Heavy Ion Collisions ◽  
Quantitative Description ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Event Generator ◽  
Third Order ◽  
Ion Collisions ◽  
Wrong Sign ◽  
Geometric Anisotropy

We study the influence of spatial and dynamical anisotropies in relativistic heavy-ion collisions on the differential elliptic and triangular flows of charged hadrons and, simultaneously, on the second- and third-order oscillations of the femtoscopic radii. Calculations of Pb + Pb collisions at s = 2.76 TeV were done within the HYDrodynamics with JETs (HYDJET++) event generator, which allows one to investigate the role of each of the anisotropy kinds separately. It is found that the bare geometric anisotropy provides either the wrong sign of elliptic and triangular flows or out-of-phase oscillations of R2out and R2side, respectively. Dynamical anisotropy is able to describe qualitatively both characteristics correctly. For the correct quantitative description of the data, one has to employ both spatial and dynamical anisotropies.

RELATIVISTIC HEAVY-ION COLLISIONS: RECENT RESULTS FROM RHIC

2004 ◽  
Vol 19 (07) ◽  
pp. 1111-1118
Author(s):  
D. HARDTKE
Keyword(s):  
Energy Loss ◽  
Nuclear Matter ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
High Energy ◽  
Jet Quenching ◽  
Relativistic Heavy Ion Collisions ◽  
Dense Medium ◽  
Relativistic Heavy Ion Collider ◽  
Ion Collisions

High energy collisions of heavy nuclei at the Relativistic Heavy-Ion Collider permit the study of nuclear matter at extreme densities and temperatures. Selected experimental highlights from the early RHIC program are presented. Measurements of the total multiplicity in heavy-ion collisions show a surprising similarity to measurements in e+e- collisions after nuclear geometry is taken into account. RHIC has sufficient center-of-mass energy to use large transverse momentum particles and jets as a probe of the nuclear medium. Signatures of "jet quenching" due to radiative gluon energy loss of fast partons in a dense medium are observed for the first time at RHIC. In order to account for this energy loss, initial energy densities of 30-100 times normal nuclear matter density are required.

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